Pipe-elbow



(No Model.) 2 Sheets-Sheet 1.

0. H. LAWRENCE.

PIPE ELBOW.

No. 485,124. Patented 001:. 25, 1892.

(No Model.) 2 Sheets-Sheet 2.

0. H. LAWRENCE.

PIPE ELBOW.

No. 485,124. Patented 0011-. 25,1892.

UNITED STATES PATENT OFFI E.

ORVILLE H. LAWRENCE, OF WVAVERLY, NEW YORK.

PIPE-ELBOW.

SPECIFICATION forming part of Letters Patent No. 485,124, dated October25, 1892.

Application filed March 5, 1892.

To all whom it may concern:

Be it known that I, ORVILLE I-I. LAWRENCE, a citizen of the UnitedStates, residing at Waverly, in the county of Tioga and State of NewYork, have invented certain new and useful Improvements in Pipe-Elbows;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to pipe-elbows; and it consists of the constructionhereinafter described and particularly claimed.

Hitherto it has been the practice in making elbow-joints in crimping thesame to form the crimps or currugations quite Widely apart, or at leaston both sides of the seam joining the parts of the elbow or on bothsides of the bend, but not so as to come together or be pressed on theunder side, but to carry the crimps the same distance apart all aroundthe pipe, or when a sharper bend was needed to corrugate the upper sideof the bend only.

My invention consists in taking a straight piece of pipe having alimited number of corrugations or crimps around the entire circumferenceof the pipe at the point where the elbow is to be formed and then bysuitable bending or staking tools to bend the pipe at this point to asharp angle, and so as to fold, flatten, and compress thecrimps, beads,or corrugations tightly together on the underside portion and at thethroat of the bend. The advantages of this construction are the makingof a much stronger elbow, one having a sharper bend when required, aneater ap pearance, and greater facility for packing the same forshipment in less bulk.

My invention is illustrated in the accompanying drawings, in whichFigure 1 is a view of a straight single section of pipe having beads,corrugations, or crimps formed around its entire circumference at apoint between its ends where the elbow is to be formed; Fig. 2, a Viewof the pipe bent, showing the invention when completed; and Fig. 3, afront view of the throat of the bend, showing more clearly the manner inwhich the beads or crimps are flattened and compressed on each other.

The means for producing my invention are shown in Figs. 4, 5, 6, and 7,and in which $erial No. 423,864. (No model.)

Fig. 4: is a side view in elevation broken away at one end of theapparatus; Fig. 5, an end View of part of the apparatus applied to thepipe; Fig. 6, a longitudinal View, partly in section, of a section ofcorrugated pipe with the staking-tools applied thereto before the pipeis bent; and Fig. 7, asimilar view showing position of the tools afterthe pipe is bent and the corrugations compressed to form my finishedelbow.

Referring to the drawings, A represents a straight single piece of pipeprovided with the beads, corrugations, or crimps 13 around its entiresurface. This pipe is beaded by any suitable means. It is then bysuitable staking-tools bent into the form shown in Figs. 2 and 3.

D represents the throat or under side of the bend, which shows the beadsor folds in the pipe flattened and pressed tightly together, so as toform a solid homogeneous mass of ridges, while the beads on the top ofthe bend have been to some extent drawn out. The result is anexceedingly stiff strong elbow made of a single piece of pipe.

The gist of my invention is the compressing of the corrugations upon oneside of the pipe, however the corrugations and the rest of the pipe maybe formed, and I have devised especial means for doing this, which areshown in Figs. 4 to 7, inclusive, but which means are not claimed inthis specification. Referring to those figures, F is the standard, inwhich is supported a staking-tool G. G is an opposite duplicatestaking-tool, to which a handle H is attached. These tools are insertedin the opposite ends of a corrugated piece of pipe A until a shoulder 8,formed on the head of each of the stakes, meets the first or outercorrugation t at each end of the corrugated part, and which corrugationsform bearings for the said shoulders. When thus inserted, the top of thebeveled inclined faces of the stakes meet at a point e, as shown in Fig.6.

K is a double set of fingers or grippers hung on wires m, united bycross-heads n and adapted to grip the corrugated part. The fingers arenarrower and sharper at their points, so that when placed on the pipeand the pipe bent the corrugations will be held in symmetrical shape.

0 is a box pivoted on the standard F and designed to be placed on theset of fingers at by compressing the corrugations upon one the beginningof the operation to hold them side thereof, substantially as described.15 in p 2. A sheet-metal elbow provided with cir- When the fingers arein place on the corcumferential corrugations, the said corruga- 5rugated part, the stake G is bent down by tions compressed together toform the throat the handle H untilthe pipe and stakes are in of theelbow, substantially as described; the position shown in Fig. 7, withthe faces of -In testimony whereof I atfix my signature in 20 the stakesbrought together and the corrugapresence of two witnesses.

tions compressed to ether ti htly and closel to on one Sim b Y ORVILLEH. LAWRENCE.

What I claim is Witnesses: 1. A sheet-metal elbow formed from a tubeROSA E. TILLOTSON,

having corrugations and bent into final shape JAMES LEWIS.

